黄土风沙区根系强化抗冲性土体构型的定量化研究

发布时间：2018-05-06 18:47

本文选题：根系 + 土壤抗冲性　；参考：《中国水土保持科学》2017年03期

【摘要】：为了探明黄土风沙区根系网络串连、根土黏结及生物化学作用对于创造抗冲性土体构型的相对重要性,以沙黄土为研究对象,通过含根土壤、无根土壤及模拟根系土壤冲刷试验,分析了根系固土总效应、物理固结效应及生物化学效应等参数。结果表明:物理固结效应在根系总效应中的贡献值平均为70.9%;与苜蓿密度90株/m~2相比,物理固结效应在处理360株/m~2中增加了6.8%;在物理固结效应中,根系串连作用较为关键,平均占比78.2%;根系物理固结效应与根表面积密度在极显著水平(P0.01)上呈指数递增函数关系。植物根系物理固结效应是强化沙黄土抗冲性土体构型的主要表现形式,且根表面积密度可较好地反映根系固土效应。
[Abstract]:In order to find out the relative importance of root soil adhesion and biochemistry to the formation of erosive soil structure in the loess sandy region, the sand loess was used as the research object. The total soil consolidation effect, physical consolidation effect and biochemical effect of root consolidation were analyzed in rootless soil and simulated root soil scouring experiments. The results showed that the contribution value of physical consolidation effect to the total root effect was 70.90.The physical consolidation effect increased 6.8% in the treatment of 360 plants / mt2 compared with 90 plants / mc-2 of alfalfa, and the cascade effect of root system was more important in the physical consolidation effect. The relationship between root physical consolidation effect and root surface area density (P0.01) was exponential. The physical consolidation effect of plant roots is the main form of strengthening the soil configuration of sandy loess, and the root surface area density can better reflect the soil consolidation effect of root system.
【作者单位】：榆林学院;陕西省陕北矿区生态修复重点实验室;西北农林科技大学水土保持研究所土壤侵蚀与旱作农业国家重点实验室;
【基金】：国家自然科学基金“水蚀风蚀交错区沙柳根系固土抗侵蚀机理研究”(41661101) 黄土高原土壤侵蚀与旱作农业国家重点实验室开放基金“电容法原位估测黄土区植物根系生物量的研究”(A314021402-1604)
【分类号】：S157.1

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